Topic

Your brain's everyday glitches

The small automatic things your mind does without asking you: the reflexes you cannot suppress, the memories it quietly rewrites, the gaps it fills in for your senses, and the strange doorway between waking and sleep. None of it is a malfunction. It is your brain working exactly as built.

motor programs your brainstem runs without asking you

Reflexes you can't stop

Munchrd: Why do you get goosebumps?

Why do you get goosebumps?

Goosebumps are a reflex. A tiny muscle at the base of every hair yanks it upright when your nervous system fires adrenaline,…

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Munchrd: Why do you get hiccups?

Why do you get hiccups?

A hiccup is a two-part reflex. First your diaphragm, the big breathing muscle under your lungs, gives a sudden involuntary…

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Munchrd: Why is yawning contagious?

Why is yawning contagious?

Yawning is contagious because your brain automatically mirrors other people. Watching or even hearing a yawn triggers the…

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Munchrd: Why do you shiver right after you pee?

Why do you shiver right after you pee?

Nobody knows for certain: there's essentially no peer-reviewed research on it. The leading guess is that emptying your…

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your mind rebuilds the past, and sometimes gets it wrong

Tricks of memory

Munchrd: Why do we get déjà vu?

Why do we get déjà vu?

The leading explanation is that déjà vu happens when your brain's familiarity signal fires without the matching recollection:…

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Munchrd: Why do you walk into a room and forget why?

Why do you walk into a room and forget why?

Your brain doesn't store life as one long film, it chops it into chapters. Crossing a doorway is one of the cleanest…

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Munchrd: Why do you forget your dreams?

Why do you forget your dreams?

You forget most dreams because your brain barely encodes them. Norepinephrine, the chemical you need to lock in a memory,…

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Munchrd: Why can't you remember being a baby?

Why can't you remember being a baby?

For most of a century the answer was "baby brains are too undeveloped to store memories." A 2025 Yale study that scanned…

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perception is the brain's best guess; these expose the guesswork

Illusions of the senses

Munchrd: Why do you have a hole in your vision you've never noticed?

Why do you have a hole in your vision you've never noticed?

Where the optic nerve exits the back of each eye, there are no light detectors, a real gap in the retina called the blind…

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Munchrd: Why can you hear a silent GIF?

Why can you hear a silent GIF?

Because for many people, strong visual motion genuinely triggers a faint sound. It's a real, measurable effect called the…

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Munchrd: Why does everyone agree which shape is 'bouba' and which is 'kiki'?

Why does everyone agree which shape is 'bouba' and which is 'kiki'?

Because the sound of a word isn't fully arbitrary. Your mouth makes bouba with soft, rounded lips and a smooth continuous…

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Munchrd: Why do you see faces in random things?

Why do you see faces in random things?

It's called face pareidolia. You have a dedicated face-detector in your brain that's tuned to fire at the faintest hint of…

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strange things at the doorway between waking and dreaming

The edge of sleep

Munchrd: Why do you wake up paralysed, with something on your chest?

Strange Phenomena

Why do you wake up paralysed, with something on your chest?

Sleep paralysis is a timing glitch: your mind wakes up before your body's REM paralysis lets go. You're conscious but frozen,…

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Munchrd: Why does your body jerk you awake as you fall asleep?

Why does your body jerk you awake as you fall asleep?

It's a hypnic jerk, a sudden, involuntary muscle twitch as your brain hands over from waking to sleep. As your muscles go…

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Munchrd: Why do some people hear a loud bang that isn't there?

Why do some people hear a loud bang that isn't there?

It's exploding head syndrome, a harmless sleep glitch. As your brain powers down for the night in stages, the leading idea is…

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Munchrd: Why did people used to sleep twice a night?

Why did people used to sleep twice a night?

Before artificial light, the standard pattern was segmented sleep: a "first sleep" of a few hours after dark, then an hour or…

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